Stocks/Funds/CIK 201772

ESSEX INVESTMENT MANAGEMENT CO LLC

long-term holder
Quarterly 13F filings · Latest period 2026-03-31 · CIK 201772
Assets
$632M
+31.8% YoY
Holdings
305
Lifetime alpha vs market
+0.13% annual
Average hold time
4.6 yr
median 4.0 yr

Quarterly history

Cum return +111% vs S&P +109% · α +1% lifetimeAUM $632M · peak $873MFlow $-31M (-5%)2016-062017-122019-062020-122022-062023-122025-062026-03
AUM ($B)fundS&P 500(gap = α)/ Flow in/out

Behavior signals (lifetime)

Dip response
-5.03%
trims when stocks drop
when a holding falls −10%+
Middle response
-2.30%
baseline attrition
Rally response
-3.44%
trims into rallies
when a holding rises +10%+

Top positions · 30

Ticker$ value% portYoYHold time
TSEMTower Semiconductor Ltd.$20M3.2%+392.1%3.0 yr
LINCLincoln Educational Serv$14M2.3%+156.3%8.8 yr
STRLSterling Infrastructure,$13M2.1%+259.7%10.5 yr
$12M1.9%2.0 yr
LGNDLigand Pharmaceuticals I$12M1.8%+89.9%2.0 yr
DRSLeonardo DRS, Inc.$12M1.8%+36.6%3.5 yr
KTOSKratos Defense & Securit$11M1.8%+137.5%4.3 yr
GSATGlobalstar, Inc.$11M1.7%+218.4%0.8 yr
INSMInsmed Incorporated$10M1.6%+114.3%3.8 yr
GHMGraham Corporation$10M1.6%+173.8%4.8 yr
MIRMMirum Pharmaceuticals, I$10M1.6%+105.1%1.0 yr
CECOCECO Environmental Corp.$9M1.5%+161.3%7.5 yr
HCIHCI Group, Inc.$9M1.4%+4.6%8.0 yr
AGXArgan, Inc.$9M1.4%+318.5%2.3 yr
AAPLApple Inc.$8M1.3%+14.7%10.5 yr

Portfolio composition (YoY)

Industry mix
Biotechnology11.8%+3.9pp$75M
Semiconductors8.9%+4.4pp$56M
Engineering & Construction7.3%+1.6pp$46M
Medical - Devices5.7%+0.1pp$36M
Aerospace & Defense5.5%+1.0pp$35M
Software - Application5.4%-0.7pp$34M
Industrial - Machinery4.2%-1.2pp$26M
Hardware, Equipment & Parts3.7%+1.0pp$23M
Unknown3.2%+0.9pp$20M
Oil & Gas Equipment & Services2.9%+0.7pp$18M
Country
US86.3%-4.1pp
IL5.4%+0.9pp
Unknown3.2%+0.9pp
CA2.1%+0.5pp
JE0.8%+0.3pp
IE0.8%+0.7pp
NL0.7%+0.2pp
CH0.6%+0.5pp
Top 5: 11.3% · Top 10: 19.9% · Top 25: 38.4%

Winners

TickerPrev $PnLYoY %
TSEM$6M+0.02B392.1%
STRL$6M+0.02B259.7%
AGX$5M+0.02B318.5%
KTOS$11M+0.01B137.5%
AMPX$3M+0.01B529.1%

Losers

TickerPrev $PnLYoY %
MSFT$7M-0.00B-0.6%

Top buys this quarter · 15

SNDX Syndax Pharmaceuticals, Inc.new+$5M
BWAY BrainsWay Ltd.+$4M
MG Mistras Group, Inc.new+$4M
NVCR NovoCure Limited+$4M
DIOD Diodes Incorporatednew+$3M
RSKD Riskified Ltd.new+$3M
AGIO Agios Pharmaceuticals, Inc.+$3M
MITK Mitek Systems, Inc.+$3M
LQDA Liquidia Corporationnew+$3M
JOUT Johnson Outdoors Inc.+$2M

Top sells this quarter · 15

TSEM Tower Semiconductor Ltd.$13M
AGX Argan, Inc.$9M
UVE Universal Insurance Holdings, exit$6M
STRL Sterling Infrastructure, Inc.$5M
GLDD Great Lakes Dredge & Dock Corpexit$5M
ANGO AngioDynamics, Inc.exit$4M
MXL MaxLinear, Inc.exit$4M
WGO Winnebago Industries, Inc.exit$3M
CRNT Ceragon Networks Ltd.exit$3M
RDCM RADCOM Ltd.exit$3M

Quarterly history (TTM returns)

PeriodAUM# PosReturn (1yr)SPY (1yr)Alpha (1yr)Flow
2026-03-31$632M305+49.93%+17.59%+32.33%-0.03B
2025-12-31$656M306+33.62%+17.72%+15.90%-0.01B
2025-09-30$653M299+38.24%+17.52%+20.73%-0.01B
2025-06-30$550M298+27.60%+14.94%+12.66%-0.03B
2025-03-31$479M303+6.53%+8.30%-1.77%-0.02B
2024-12-31$556M307+28.72%+24.89%+3.84%-0.05B
2024-09-30$574M302+34.81%+36.04%-1.23%-0.02B
2024-06-30$535M302+10.82%+24.49%-13.67%+0.03B
2024-03-31$507M306+15.72%+29.62%-13.90%-0.05B
2023-12-31$508M315+11.14%+26.18%-15.04%-0.17B
2023-09-30$613M356+0.43%+21.57%-21.14%-0.04B
2023-06-30$716M368+10.81%+19.42%-8.61%-0.01B
2023-03-31$688M385-17.08%-7.82%-9.26%+0.02B
2022-12-31$642M394-24.32%-18.17%-6.14%+0.01B
2022-09-30$627M411-16.35%-15.51%-0.84%+0.00B
2022-06-30$619M423-16.27%-10.62%-5.65%-0.01B